Research on Cables Coupled Effect of Combo Steel Tube Tower-Line System for Large Crossing Transmission Lines

Abstract eng:
A tower-line system of large crossing transmission lines is a complicated special tower line coupled vibration system, suffering both from static and dynamic loads. Vibration is the main cause of its failure. Because of its high-weakness character, and lines and isolators rings having strong geometrical non-linearity, it is very difficult to calculate accurately. At present, in order to simplify the calculation, lines and tower are analyzed separately in present design code ignoring coupled effect of tower and lines, to result analyzing errors. In order to calculate dynamic response of tower-line system considering the coupled effects, with ANSYS program of the finite element method，it was established a new spatial analytical—numericalmodelof220kVcombo steel tube tower for large crossing transmission lines crossing Tiezhuang canal of Pearl River． Firstly， exactitude the of finite element modal and theoretic calculation was proved by environmental vibration testing and modal identification．In addition，some specialties were acquired by analyzing dynamic characteristics and seismic response of the tower considered transmission lines and none-considered transmission lines．The effects of transmission lines applied to tower were studied an d further disclosed coupled regularity of transmission lines applied to tower．It is shown that suspended cables have mass effects，which is not ignored．Simultaneously， suspended cables have coupled stiffness effects applied to tower on cross direction and longitudinal direction．Furthermore，it is found that suspended cables can depress seismic response of transmission towers．Finally，it is pointed out that suspended cable’s effect of depress seismic response whether or not have universality need to be further studied and cognized．The above research and analysis have some reference values for seismic and wind resistance design of similar transmission tower．

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